points_in_circle: Find points within a circle around a center coordinate

In spatialrisk: Calculating Spatial Risk

Find points within a circle around a center coordinate

Description

This function selects rows from a data frame whose longitude/latitude coordinates fall within a given radius (in meters) from a specified center point. It also calculates the distance of each point to the center.

Usage

points_in_circle(
  data,
  lon_center,
  lat_center,
  lon = lon,
  lat = lat,
  radius = 200,
  sort = TRUE
)

Arguments

data	A data frame containing at least longitude and latitude columns.
lon_center	Numeric scalar, longitude of the circle center.
lat_center	Numeric scalar, latitude of the circle center.
lon	Name of the longitude column in data.
lat	Name of the latitude column in data.
radius	Numeric, circle radius in meters. Default is 200.
sort	Logical, if TRUE (default) results are sorted by distance from the center (closest first). If FALSE, the order of data is preserved.

Value

A data frame subset of data with an extra column distance_m giving the distance to the center point.

Author(s)

Martin Haringa

Examples

points_in_circle(Groningen, lon_center = 6.571561, lat_center = 53.21326,
radius = 60)

spatialrisk documentation built on Sept. 14, 2025, 5:08 p.m.